I actually have Origin installed on my laptop that my SO uses. She loves The Sims 3 that I had bought a retail copy of. I later bought a Steam copy on a sale just for convenience sake of not needing the disc. The problem came in when I wanted to play a Steam game but she wanted to play The Sims 3 on the laptop. Since I had a retail copy, I just activated the key on Origin (something I could not do on Steam) and now she can play with all the convenience of digital delivery but not impact my gaming time by making me log out of Steam.

That's a perfect use case for Origin, in my mind :)